from salad + -ing
“…Sow also (if you please) for early Colly-flowers.
Sow Chervil, Lettuce, Radish, and other (more delicate) Salletings; if you will raise in the Hot-bed.
In over wet, or hard weather, cleanse, mend, sharpen and prepare Garden-tools…”
From: Kalendarium Hortense:
Or, The Gard’ners Almanac
– John Evelyn, 1666